@AlertNewEngland first mentioned this in my Twitter feed which is what prompted me to hunt it down, but I see as of this writing no major news outlets have picked it up yet.
Last evening, a B762 departed PHL en route to Brussels, but turned around shortly after the handoff from Boston Center to Moncton Center (and a frequency not currently covered by LiveATC). The flight crew apparently declared an emergency with Moncton and turned right around, as they were back in Boston Center's control within 15 minutes of being handed off to Moncton.
The audio captures everything except that snippet of time with Moncton, and then on final approach, BOS Twr has the crew switch to a frequency used by Bradley International - and our feed provider at Bradley can't quite reach all the way to Logan, so the story ends with that new frequency assignment.
@AlertNewEngland reported the plane landed safely.